To install your Vortex Razor, C-More RTS or STS red-dot sight, first remove the rear sight from your firearm and replace it with the EGW mount. The mount can be easily removed, allowing you to reinstall the rear sight at any time. All necessary mounting hardware is included. The EGW mount facilitates the seamless installation of Vortex Razor, C-More RTS, or STS red-dot sights onto the Smith & Wesson M&P 22 by substituting the rear sight To ensure a secure attachment, apply blue loctite to the screws and tighten them to 15 in-lb using a 5/64 inches Allen wrench The mount is reversible, allowing for the original rear sight to be reinstalled at any time It includes all necessary hardware for installation